Dust collector for middlings purifiers



2 Sheets-Sheet 1.

(No Model.)

J. M. CASE. DUST GOLLEGTOB. FOR MIDDLINGS PURIFIERS.

Patented July 30, 1889'.

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2'Sheets-Sheet 2. J. M. CASE. DUST GOLLECTDR FOR MIDDLINGS PURIFIERS.

. Patented July so, 1889.

(No Model.)

UNITED STATES ATENT OFFICE.

JOHN M. CASE, OF COLUMBUS, OHIO, ASSIGNOR TO THE CASE MANUFAC- TURING COMPANY, OF SAME PLACE.

DUST-COLLECTOR FOR MlDDLlNGS-PURIFIERS.

SPECIFICATION forming part of Letters Patent No. 407,948, dated July 30, 1889.

Application filed March 30, 1887. Serial No. 233,0] 1. (N0 model.)

To all whom it may concern:

Be it known that 1, JOHN M. CASE, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Dust-Collectors for Middlings-Purifiers, of which the following is a specification.

This invention relates, first, to certain improvements in the receptacle for catching the dust which is dislodged from the dust-arresting cloth, and, secondly, to the means for dislodging the dust.

In the drawings the dust-arresting cloth is represented as situated in the upper part of the casing of a middlings-purifier; but I desire to have it understood that the present invention is not limited in its application to any one particular kind of machine. On the contrary, it may be applied to a machine of any construction or character, or it may be employed in an entirely separate and distinct casin g, in which instance the dust-laden air which has been used for handling or treating the stock in any part of the machine is conveyed to it by pipes in the manner described in two applications of even date herewith.

The invention consists in certain features of novelty, which are hereinafter particularly pointed out in the claims, being first fully described with reference to the accompanying drawings, in which- Figure I is a vertical longitudinal section of a middlings-purifier with the invention applied thereto. Fig. 11 is a section in about the same plane, showing more particu-' larly and on a larger scale the principal features of the present invention and only aportion of the casing of the machine. Fig. III is a section on the line III Ill, Fig. II, looking in the direction of the arrow. Fig. IV is a plan view of the dust-catching receptacle. Fig. V is an axial section of the hollow takeup drum, hereinafter more particularly de scribed.

hereinafter particularly referred to.

1 represents the casing of the machine, and 2 an air-trunk which communicates with the eye of a fan 3 and with the interior of the Fig. V1 is a section showing details casing, the latter communication being under control of valves 4:.

5 represents the sh akin g-bolt, suspended by hangers 6, and provided at one end with a feed-trough 7 into which material is delivered by a spout 8.

9 represents a shaft which is provided with an eccentric 10, around which fits a yoke formed at the extremity of a spring-pitman 11, whose other end is connected to the bolt 5. This shaft is also provided with an eccentric 12, which is surrounded-by a yoke secured to the end of a flexible strap 13, whose other end is connected to the reciprocating conveyer 14 for moving it in one direction, the return movement being produced by a spring 15. This mechanism is not claimed in this application and needs no further description here.

16 represents the cloth for separating the dust from the air as it is drawn upward by the fan This cloth is supported in the manner fully described and claimed in my contemporaneous application, Serial No. 233,010, and needs only a brief description for the purposes of this application.

17 17 represent a pair of movable strips to which the edges of the cloth are respectively secured, these strips being received within rectangular groov es out in the adjacent faces of the two parallel side bars 18 18 of the clothframe, within which they may be adjusted by means of screws 19. These side bars are fixed at their extremities to the corner-posts or other fixed parts of the casing of the machine. Each end of the cloth is secured between two boards 20 and 21, the lower one 20 of which is fixed to the side bars 18 or other fixed part, while the upper one 21 is clamped securely thereto by thumb nuts and screws 22. The side bars 18 are situated centrally within horizontal slots 23 cut in the sides of the easing 1 nearly from end to end of the machine. The spaces left between the sides of the side bars 18 and the slots 28 are covered by strips 24 of canvas or other flexible material, secured to the outside. of the casing, so that no air can enter at this point or pass from the lower to the upper part of the machine around the cloth-frame. These strips are covered by a housing 25, all as fully described in my ap plication above mentioned.

The device for dislodging the dust is situated on the upper side of the cloth, and will now be described.

26 represents a board, each end of which is secured by nuts and bolts or other means to one end of a metallic strap '27, which straps extend around the side bars 18, passing first outward and then inward through the slots 23, terminating beneath the cloth 16. This board is provided with a central longitudinal slot extending nearly its entire length for the reception of a tube 28, whose lower side is provided with a longitudinal slit opening in proximity to the upper side of the cloth, the edges of the tube being turned over, as shown in Fig. II, so as to present a curved surface to the cloth. Communicating with this tube is a flexible tube 29, which is coiled upon a hollow drum 30, with the interior of which it also has communication, as shown more clearly in Fig. V. One of the trunnions 31 of this drum is hollow and forms communication between the interior of the drum and the nozzle 32" of an auxiliary fan 32. This auxiliary fan may of course be dispensed with and suitable connection formed between the fan 3 and the interior of the drum 30.

33 represents a coiled spring, one end of which is secured to the end of the drum 30 and the other to a fixed part, the purpose being to turn the drum in one direction for the purpose of keeping the slack of the tube 29 wound thereon.

34 is a double screw, or one havinga groove out therein in opposite directions, which is rotated by suitable gearing. This screw passes through a short tube 35,passing transversely through the tube 28 and fitted air-tight, so that no air will leak out around it. At the ends of this tube are brackets 36, rising upward. from the board 26, and also perforated for the passage of the screw 34:. Within the perforation of one of these brackets is situated the swiveled traveler 37, Fig. VI, which is designed to fit in one of the grooves in the screw and cause the board 26 and the parts secured thereto to move to and fro from one end of the screw to the other as said screw rotates.

It will be understood that the groove running in one direction is a continuation of the groove running in the other directionthat is to say, the two are united at the ends by a gradual curve, so that the traveler will move from one into the other automatically. This mechanism is a well-known mechanical expedient and needs no further description here. As the board 26, with its attachments, is

, moved toward the ends of the machine, the

flexible tube 29 will be unwound from the drum 30, and as they approach the center of the machine the tube will be wound upon the said drum by the action of the spring The receptacle for catching the dust dis-' vent its abrasion.

lodged from the cloth by the mechanism just described consists of a box or trough 38,11aving its upper side open and situated in close proximity to the under side of the cloth 16, the box being supported at its ends by the metallic straps 27. J ournaled in the ends of the box, and parallel with the sides thereof, is a pair of rollers 39, whose peripheries project slightly above the upper edge of the box, so as to have contact with the cloth and pre- These rollers also project into circular grooves cut longitudinally in the inner surfaces of the respective sides of the box, so as to more effectually prevent the passage of air between the rollers and the said sides. These grooves may, if desired, be lined with some yielding material-such as pile fabric-for more perfectly accomplishing this result. It will now be seen that, the box being practically air-tight, the air projected through the cloth by the tube 28 will return on each side of the said tube, passing up through longitudinal slots 4L0 cut through the board 26 on opposite sides of its center, as shown by the arrows in Fig. II. The bottom of the box 38 is movable and connected to one of the sides by means of a leather hinge consisting of a strip of leather ll, extending the entire length of the movable portion of the bottom and secured at its respective ends to said bottom and one side of the box, as represented in Fig. II. The bottom of the box is held normally closed by a catch 4E2, pivoted to the box and held normally in position to engage and hold up the bottom by a coiled spring 43, interposed between the tail of the catch and'the box, as shown more clearly in Fig. II. When the box is about to arrive at the limit of its permitted movement, a stop impinges against the tail of the catch and moves its barb from beneath the hinged bottom, liberating it and permitting it to fall, as shown by dotted lines in Fig. ll, thereby discharging its contents into a trough formed by a board 46 and the end of the casing, in which trough is situated a oonveyer 4:4, driven by suitable belts or gearing on the outside of the casing. consisting of the fixed end board 20'of the cloth-frame; but it is manifest that any other part of the machine or frame whfch is situated in the path of the box may be made available for this purpose. \Nhen the bottom is liberated, it falls against a spring-stop 45, consisting, preferably, of a block of rubber, which causes the bottom to bounce up and down several times before it comes to rest,

This stop is here shown as thereby not only completely shaking off all the dust, but also preventing the noise and the jarring of the machine which would otherwise occur. This stop is also so situated as to limit the extent to which the bottom shall Open, so as to avoid injuring the hinge and also to make it easier to close. It is closed automatically as the box starts to move in ICC the opposite direction by impinging against the upper edge of a board 46, which forms one side of the conveyer-trough, the top edge of this board being so situated that the bottom of the box barely clears it when closed. The bottom being open or in the position shown by dotted lines in Fig. II, it is obvious that when the box is moved to the right, as there represented, the bottom will be elevated into horizontal position, and once elevated will be held by the spring-catch 42. The upper edge of the board 46 is notched at 46 for permitting the lower end of the catch 42 to pass.

It will be observed that the hinged bottom does not extend the entire length of the box, this being due to the fact that the straps 27, which support it, extend beneath it. To the fixed part of the bottom, at each end of the movable part and within the box, is secured a strip 47, of canvas or other flexible material, which strips project over the ends of the hinged portion of the bottom, covering the cracks and forming a practically air-tight joint. A similar strip 48 is also secured to the inner surface of the side of the box remote from the hinge, so as to form a tight joint at this point. These strips, in conjunction with the continuous leather hinge, make the bottom practically air-tight, causing the air which is blown thereinto to pass out at top, returning through the-cloth, as already described.

If the straps 27 are not extended beneath the box, but terminate at the ends thereof, the entire bottom may be hinged and the strips 47 secured in a manner similar to the strip 48.

In order that the device hereinbefore described may operate perfectly, it is essential that no air be allowed to leave or enter the dirt-receptacle excepting through the cloth, and in order to render the said receptacle thus tight it is not only necessary that its hinged bottom be tightly closed, but also that its open top have constantcontact with the under side of the cloth. For this reason I but this is not the equivalent of my invention.

In such a device it is impossible to make the receptacle anything like air-tight.

I am also aware that it has been proposed to provide such receptacle with a hinged bottom, which is held normally closed by a beam or guide-rail, upon which it rests.

I am also aware that spring-catches are not new, and such I do not claim as my invention. 1

Having thus described my invention, the following is whatI claim as new therein and desire to secure by Letters Patent:

1. In a dust-collector, the combination, with the dust-arresting cloth and means for dislodging the dust therefrom, of a'dust-catching receptacle, means for moving it along the cloth, and rollers carried by the receptacle and bearing against the cloth, substantially as set forth.

2. Ina dust-collector, the combination, with the flat dust-arresting cloth and means for dislodgin g the 'dust therefrom, of a dust-catch- I in g receptacle placed beneath and having continuous contact with the under side of the cloth, whereby the air is prevented from entering said receptacle except through the cloth, and means for moving said receptacle over the under surface of the cloth, substantially as set forth.

3. In a dust-collector, the combination, with the flat dustarresting cloth, of a dust-catching receptacle placed beneath the cloth and having its open top side constantly in contact therewith, a cleaner in contact with the upper side of the cloth and immediately over the dust receptacle for dislodging the dust, and means for moving the dust-receptacle and cleaner together, substantially as set forth,

4. In a dust-collector, the combination of a flat dust-arresting cloth, a dustr'catching receptacle, consisting of an open box having its open side in constant contact with the under side of the cloth, a pipe or tube having a minute jet-orifice in contact with the upper side of the cloth, a fan, and means for moving said tube and dust-receptacle together, substantially as set forth.

5. The combination of the flat cloth, atube placed in contact with the upper side thereof and having a minute jet-orifice at the point of contact, a fan, suitable connections between said tube and fan, a dirt-receptacle having its open side in continuous contact with the under side of the cloth, so as to prevent the air from entering or leaving said receptacle except through the cloth, and means for moving said tube and receptacle together over the surface of the cloth, substantially as set forth.

6. The combination,with the cloth, of a tube having a j et-orifice placed in proximity thereto, means for moving said tube, a fan, aflexible tube forming communication between said fan and tube, a drum upon which said tube is wound, and a spring actuating the drum in a direction to wind the tube thereon, substantially as set forth.

7 The combination, with the cloth, a blasttube having a jet-orifice placed in proximity thereto, and means for moving said tube, of a fan, a hollow drum with which said fan communicates, a flexible tube communicating at one end with said drum and at the other with said blasttube, and means for turning said drum in a direction to wind the tube thereon, substantially as set forth.

8. In a dust-collector, the combination of the cloth directly beneath said board, and means 10 cloth, a tube havinga jetorifice, a fan having for moving the tube, board, and receptacle toconnection therewith, a board placed transgether along the cloth, substantially as set Versely of the cloth and in proximity to the forth.

5 upper face thereof, havingacentral longitudi- J M C ASE nal slot for the reception of said tube and a slot at each side thereof, for the purpose set WVitnesses: forth, a practically air-tight dust-receptacle OCTAVIUS KNIGHT, placed in proximity to the under side of the L. M. HOPKINSh 

